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Spatial variation in sapwood area to leaf area ratio and specific leaf area within a crown of silver birch

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Abstract

Spatial variation in sapwood area to leaf area ratio (Huber value, HV) and specific leaf area (SLA) was examined in branches of closed-canopy trees of silver birch (Betula pendula Roth). HV increased basipetally within a crown and decreased with increasing branch order, but exhibited no significant radial trend along a primary branch. HV was primarily determined by branch position in a crown and branch diameter at the sampling point, being independent of the size of the tree and branch. Greater HV in the lower-crown branches is considered a means to mitigate differences in hydraulic transport capacity between the branches located in different canopy layers. Beside branch position and sampling location on a branch, SLA depended significantly on several other variables characterising tree and branch size. SLA increased basipetally within a crown and along a primary branch, but exhibited no significant trend with branch orders. Because height caused leaf area (AL) to diminish more rapidly than leaf dry weight, AL primarily determined the vertical variation in SLA.

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Acknowledgements

This study was supported by grant No. 5296 from the Estonian Science Foundation. We are grateful to Mr. Ilmar Part for language correction.

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Authors and Affiliations

  1. Institute of Botany and Ecology, University of Tartu, Lai 40, 51005, Tartu, Estonia

    Arne Sellin

  2. Institute of Botany and Ecology, University of Tartu, Lai 40, 51005, Tartu, Estonia

    Priit Kupper

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  1. Arne Sellin
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  2. Priit Kupper
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Correspondence to Arne Sellin.

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Communicated by H. Cochard

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Sellin, A., Kupper, P. Spatial variation in sapwood area to leaf area ratio and specific leaf area within a crown of silver birch. Trees 20, 311–319 (2006). https://doi.org/10.1007/s00468-005-0042-2

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  • DOI: https://doi.org/10.1007/s00468-005-0042-2

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